WO2015060514A1 - Procédé et dispositif d'empêchement de brouillage dans une zone de service en chevauchement - Google Patents

Procédé et dispositif d'empêchement de brouillage dans une zone de service en chevauchement Download PDF

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Publication number
WO2015060514A1
WO2015060514A1 PCT/KR2014/005400 KR2014005400W WO2015060514A1 WO 2015060514 A1 WO2015060514 A1 WO 2015060514A1 KR 2014005400 W KR2014005400 W KR 2014005400W WO 2015060514 A1 WO2015060514 A1 WO 2015060514A1
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Prior art keywords
interference
sounding ppdu
frame
sounding
interfering
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PCT/KR2014/005400
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English (en)
Korean (ko)
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석용호
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엘지전자 주식회사
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Priority to US15/024,765 priority Critical patent/US10051640B2/en
Priority to KR1020167010589A priority patent/KR101871080B1/ko
Publication of WO2015060514A1 publication Critical patent/WO2015060514A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • H04L1/008—Formats for control data where the control data relates to payload of a different packet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/27—Control channels or signalling for resource management between access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to wireless communication, and more particularly, to an interference prevention method and apparatus in a wireless communication system.
  • BSS Basic Service Set
  • the first of the BSS is an independent BSS (IBSS), which means an ad-hoc mode, and can directly perform communication between STAs without going through an AP.
  • IBSS does not allow connection to a distribution system (DS).
  • DS distribution system
  • IBSS can form a self-contained network.
  • the second of the BSSs may be an infrastructure BSS.
  • the infrastructure BSS is composed of an AP and a plurality of STAs, and the AP may be connected to the DS.
  • OBSS overlapping basic service set
  • OBSS overlapping basic service set
  • OBSS can occur if there are many BSSs or if the number of frequency channels is small using a wide bandwidth of 80 MHz / 160 MHz as in TGac.
  • performance may be drastically reduced due to interference between STAs.
  • BSSs may apply a selection algorithm that can actively select a usable channel, or a mechanism for communicating between overlapping BSSs.
  • a mechanism may be used in which communication of another overlapped BSS is stopped while the target BSS communicates.
  • various methods for preventing interference generated between the AP and the STA in the OBSS environment have been studied.
  • Another object of the present invention is to provide an apparatus for performing a method for preventing interference in an overlapping service area.
  • the interference AP receives a beacon frame broadcast by the AP,
  • the beacon frame includes an interference avoidance information element, wherein the interfering AP is a sounding PPDU (PLCP) protocol data directed from the AP based on the interference avoidance information element.
  • receiving a unit the interfering AP determining a transmitting steer matrix based on the sounding PPDU, and the interfering AP transmitting data through a beam generated based on the transmitting steering matrix. It may include the step.
  • the AP is implemented to transmit or receive a radio signal
  • a processor selectively connected to the RF unit, wherein the processor receives a beacon frame broadcast by another AP, wherein the beacon frame is an interference avoidance information element.
  • PLCP physical layer convergence procedure protocol data unit
  • interference that may occur in communication between STAs may be prevented based on a sounding frame. Therefore, interference between STAs may be reduced in an environment where OBSS may occur, such as when there are many BSSs or when the number of available frequency channels is small.
  • WLAN wireless local area network
  • FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
  • FIG. 3 is a conceptual diagram illustrating an OBSS environment.
  • FIG. 4 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • FIG. 5 is a conceptual diagram illustrating a sounding PPDU transmitted to reduce interference in an OBSS environment according to an embodiment of the present invention.
  • FIG. 6 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • FIG. 7 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • FIG. 8 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • FIG. 9 is a conceptual diagram illustrating an interference mitigation method according to an embodiment of the present invention.
  • FIG. 10 is a conceptual diagram illustrating an interference mitigation method according to an embodiment of the present invention.
  • FIG. 11 is a conceptual diagram illustrating an interference mitigation method in an OBSS environment according to an embodiment of the present invention.
  • FIG. 12 is a conceptual diagram illustrating an interference mitigation method in an OBSS environment according to an embodiment of the present invention.
  • FIG. 13 is a conceptual diagram for a method of transmitting a calibrated sounding PPDU according to an embodiment of the present invention.
  • FIG. 14 is a flowchart illustrating a method of transmitting a calibrated sounding PPDU according to an embodiment of the present invention.
  • 15 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • WLAN wireless local area network
  • FIG. 1 shows the structure of an infrastructure network of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system may include one or more basic service sets (BSSs) 100 and 105.
  • the BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
  • the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
  • the infrastructure BSS may include at least one STA, APs 125 and 130 that provide a distribution service, and a distribution system DS that connects a plurality of APs.
  • the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
  • ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
  • a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
  • a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • BSS basic service set
  • FIG. 1 is a conceptual diagram illustrating an independent BSS.
  • an independent BSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-1, and 155-2 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-1, and 155-2 may be mobile STAs, and are not allowed to access a distributed system. network).
  • a STA is any functional medium that includes a medium access control (MAC) and physical layer interface to a wireless medium that conforms to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. May be used to mean both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • UE mobile subscriber unit
  • It may also be called various names such as a mobile subscriber unit or simply a user.
  • FIG. 2 is a diagram illustrating a layer architecture of a WLAN system supported by IEEE 802.11.
  • FIG. 2 conceptually illustrates a PHY architecture of a WLAN system.
  • the hierarchical architecture of a WLAN system may include a medium access control (MAC) sublayer (220), a physical layer convergence procedure (PLCP) sublayer 210, and a physical medium dependent (PMD) sublayer 200.
  • the PLCP sublayer 210 is implemented such that the MAC sublayer 220 can operate with a minimum dependency on the PMD sublayer 200.
  • the PMD sublayer 200 may serve as a transmission interface for transmitting and receiving data between a plurality of STAs.
  • the MAC sublayer 220, the PLCP sublayer 210, and the PMD sublayer 200 may conceptually include a management entity.
  • the management unit of the MAC sublayer 220 is referred to as a MAC Layer Management Entity (MLME) 225, and the management unit of the physical layer is referred to as a PHY Layer Management Entity (PLME) 215.
  • MLME MAC Layer Management Entity
  • PLME PHY Layer Management Entity
  • Such management units may provide an interface on which layer management operations are performed.
  • the PLME 215 may be connected to the MLME 225 to perform management operations of the PLCP sublayer 210 and the PMD sublayer 200, and the MLME 225 may also be connected to the PLME 215 and connected to the MAC.
  • a management operation of the sublayer 220 may be performed.
  • SME 250 may operate as a component independent of the layer.
  • the MLME, PLME, and SME may transmit and receive information between mutual components based on primitives.
  • the PLCP sublayer 110 may convert the MAC Protocol Data Unit (MPDU) received from the MAC sublayer 220 according to the indication of the MAC layer between the MAC sublayer 220 and the PMD sublayer 200. Or a frame coming from the PMD sublayer 200 to the MAC sublayer 220.
  • the PMD sublayer 200 may be a PLCP lower layer to perform data transmission and reception between a plurality of STAs over a wireless medium.
  • the MAC protocol data unit (MPDU) delivered by the MAC sublayer 220 is called a physical service data unit (PSDU) in the PLCP sublayer 210.
  • the MPDU is similar to the PSDU. However, when an A-MPDU (aggregated MPDU) that aggregates a plurality of MPDUs is delivered, the individual MPDUs and the PSDUs may be different from each other.
  • the PLCP sublayer 210 adds an additional field including information required by the physical layer transceiver in the process of receiving the PSDU from the MAC sublayer 220 to the PMD sublayer 200.
  • the added field may be a PLCP preamble, a PLCP header, and tail bits required to return the convolutional encoder to a zero state in the PSDU.
  • the PLCP preamble may serve to prepare the receiver for synchronization and antenna diversity before the PSDU is transmitted.
  • the data field may include a coded sequence encoded with a padding bits, a service field including a bit sequence for initializing a scrambler, and a bit sequence appended with tail bits in the PSDU.
  • the encoding scheme may be selected from either binary convolutional coding (BCC) encoding or low density parity check (LDPC) encoding according to the encoding scheme supported by the STA receiving the PPDU.
  • BCC binary convolutional coding
  • LDPC low density parity check
  • the PLCP header may include a field including information on a PLC Protocol Data Unit (PPDU) to be transmitted.
  • the PLCP sublayer 210 adds the above-described fields to the PSDU, generates a PPDU (PLCP Protocol Data Unit), and transmits it to the receiving station via the PMD sublayer 200, and the receiving station receives the PPDU to receive the PLCP preamble and PLCP. Obtain and restore information necessary for data restoration from the header.
  • PPDU PLCP Protocol Data Unit
  • FIG. 3 is a conceptual diagram illustrating an OBSS environment.
  • OBSS overlapping basic service set
  • the service area may be expressed as coverage in another term.
  • the coverage of an STA may be an area (Tx / Rx range) in which data may be transmitted to or received from another STA.
  • the coverage of the STA may mean a carrier sensing range (CS range) capable of carrier sensing for data transmitted from another terminal.
  • CS range carrier sensing range
  • FIG. 3 illustrates a case where a plurality of STAs 310 and 320 exist in a coverage overlapping range of each of the plurality of BSSs.
  • STAs 310 and 320 communicating with a specific AP may be interfered with by data transmitted from another AP. Therefore, performance degradation of communication between the STAs 310 and 320 and a specific AP may occur due to the interference.
  • interference may occur between the AP and the other AP as well as between the STA and the other AP.
  • an AP causing interference may be expressed by the term interference AP.
  • the direction of the beam transmitted by the interfering AP may be controlled based on the sounding PPDU transmitted between the AP and the interfering AP or between the interfering AP and the STA.
  • the beam direction of the interfering AP determined based on the sounding PPDU may be determined to reduce the interference between the AP and the interfering AP or between the interfering AP and the STA.
  • FIG 3 shows an OBSS environment in which APs constituting each of the plurality of BSSs are located in an overlapped area between the plurality of BSSs.
  • STA2 370 is located within the coverage of AP1 350 and AP2 360.
  • the AP2 360 and the STA2 370 communicate with each other, the AP2 360 may form a beam for transmitting data to the STA2 370.
  • AP2 360 and STA2 370 are located within the coverage of AP1 350, communication between AP2 360 and STA2 370 may be interfered by the beam formed by AP1 350.
  • an embodiment of the present invention discloses a method for reducing interference with an STA in an OBSS environment.
  • AP1 is an interfering AP and initiates an interference mitigation procedure for mitigating interference by AP1 in communication between AP2 and STA2.
  • FIG. 4 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • the coverage area for the first BSS including the AP1 410 and the coverage area for the second BSS including the AP2 420 may overlap.
  • the AP2 420 broadcasts an interference avoidance request frame (I-avoidance request frame) 425 to avoid interference from neighbor STAs and / or neighbor APs that do not communicate with the AP2 420 in communication.
  • I-avoidance request frame an interference avoidance request frame 425 to avoid interference from neighbor STAs and / or neighbor APs that do not communicate with the AP2 420 in communication.
  • the interference prevention request frame 425 may be broadcast to the neighbor STA and / or the neighbor AP in order to prevent interference by the neighbor STA and the neighbor AP, which may occur in the communication of the AP2 420.
  • the interference prevention request frame 425 may be broadcast to the neighbor STA and / or the neighbor AP in order to prevent continuous interference in the interference situation.
  • the neighbor STA and / or the neighbor AP receiving the interference prevention request frame 425 may transmit an interference avoidance response frame (I-avoidance response frame) 415.
  • the neighboring AP and / or the neighboring STA that transmits the interference prevention response frame 415 does not communicate with (or associate with) the STA or AP that transmitted the interference request frame (in the case of FIG. 4, AP2 420).
  • AP and / or STA.
  • the AP1 410 may transmit an interference prevention response frame 415 to the AP2 420.
  • AP2 420 may transmit a sounding PPDU 435 to AP1 410.
  • the AP1 410 may acquire channel information between the AP1 410 and the AP2 420.
  • AP1 410 may determine an appropriate transmitting steer matrix for transmitting data to STA2 400 based on the sounding PPDU 435 received from AP2 420.
  • AP1 410 forms a beam for data transmission based on the determined transmission steering matrix, interference by AP1 410 in AP2 420 may be minimized.
  • the beam formed by AP1 410 may be determined using a transmission steering matrix determined based on the sounding PPDU 435 transmitted by AP2 420.
  • a beam used when performing communication between the AP1 410 and the STA2 400 based on the transmission steering matrix may interfere with the communication between the AP2 420 and the STA (eg, STA2, STA3, STA4).
  • downlink data transmission by the AP1 410 to the STA2 400 and uplink data transmission by the STA3 and / or the STA4 to the AP2 420 may occur at the same time.
  • the beam of AP1 410 generated based on the transmission steering matrix may be formed in a direction of reducing interference between AP1 410 and AP2 420. Therefore, overall throughput may be increased in view of the WLAN system.
  • the sounding PPDU transmitted by the AP2 420 to the AP1 410 may be, for example, a null data packet (NDP) frame.
  • the NDP frame may be a null data packet, and the NDP frame may include only a PLCP header and a PLCP preamble excluding the data field.
  • FIG. 5 is a conceptual diagram illustrating a sounding PPDU transmitted to reduce interference in an OBSS environment according to an embodiment of the present invention.
  • the sounding PPDU may be an NDP frame that does not include a data field.
  • the NDP frame includes a legacy short training field (L-STF) 500, a legacy long training field (L-LTF) 510, a legacy signal (L-SIG) field 520, and a very high throughput (SHT-SIG-).
  • L-STF legacy short training field
  • L-LTF legacy long training field
  • L-SIG legacy signal
  • SHT-SIG- very high throughput
  • a 530, VHT-STF 540, VHT-LTF 550, and VHT-SIG-B 560 may be further included.
  • Each of the L-STF 500, L-LTF 510, and L-SIG 520 fields included in the NDP frame may be used for frequency offset adjustment, phase offset adjustment, and channel prediction for the legacy STA.
  • the L-STF 500 may include a short training orthogonal frequency division multiplexing symbol.
  • the L-STF 500 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 510 may include a long training orthogonal frequency division multiplexing symbol.
  • the L-LTF 510 may be used for fine frequency / time synchronization and channel prediction.
  • the L-SIG 520 may be used to transmit control information.
  • the L-SIG 520 may include information about a data rate and a data length.
  • the VHT format PPDU may further include a VHT-SIG-A 530, a VHT-STF 540, a VHT-LTF 550, and a VHT-SIG-B 560.
  • the VHT-SIG-A 530, VHT-STF 540, VHT-LTF 550, and VHT-SIG-B 560 may be used for a terminal that supports a VHT system.
  • the VHT-SIG-A 530 may include information for interpreting the VHT format PPDU.
  • the VHT-SIG-A 530 may include a VHT-SIG-A1 and a VHT-SIG-A2.
  • VHT-SIG-A1 is used for bandwidth information of the channel used, whether spatial time block coding is applied, group identifier (MU) for MU (multi-user) -multi-input multiple output (MIMO) transmission, and MU-MIMO transmission. It may include information about the number of streams to be.
  • MU group identifier
  • MIMO multi-input multiple output
  • the VHT-SIG-A2 provides information on whether to use a short guard interval (GI), forward error correction (FEC) information, information on a modulation and coding scheme (MCS) for a single user, and multiple users.
  • GI short guard interval
  • FEC forward error correction
  • MCS modulation and coding scheme
  • the VHT-STF 540 may be used to improve automatic gain control estimation in a MIMO environment.
  • the VHT-LTF 550 may be used to estimate a channel in a MIMO environment.
  • the STA may perform channel prediction on a 20/40/80/160/80 + 80 MHz channel bandwidth based on the VHT-LTF 550.
  • the VHT-SIG-B 560 may include information about each STA, that is, a length of a PLCC service data unit (PSDU), information on a modulation and coding scheme (MCS), a tail bit, and the like.
  • PSDU PLCC service data unit
  • MCS modulation and coding scheme
  • the STA or AP receiving the interference prevention request frame may perform channel prediction based on the training field included in the NDP frame and determine a transmission steering matrix for forming the beam based on the channel prediction.
  • FIG. 6 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • an STA or AP receiving an interference prevention request frame posts a method of transmitting a sounding PPDU after transmitting an interference prevention response frame.
  • a STA or an AP transmitting an interference prevention response frame may transmit a sounding PPDU, not an STA or an AP transmitting an interference prevention request frame.
  • AP2 620 may broadcast an interference prevention request frame, and AP1 610 may receive an interference prevention request frame 625.
  • the AP1 610 Upon receiving the interference prevention request frame 625, the AP1 610 transmits a sounding PPDU (eg, NDP frame) 620 after a predetermined time interval (eg, short inter-frame spcae). Can be.
  • a sounding PPDU eg, NDP frame
  • a predetermined time interval eg, short inter-frame spcae
  • AP2 620 When AP1 610 transmits the sounding PPDU 635 to AP2 620, AP2 620 is a channel for the channel between AP1 610 and AP2 620 based on the sounding PPDU 635. You can make predictions.
  • the AP2 620 may transmit a channel prediction result (channel prediction information or channel state information 645) performed based on the sounding PPDU 635 to the AP1 610.
  • AP1 610 may determine an appropriate transmission coordination matrix for transmitting data to STA2 600 based on channel state information 645 received from AP2 620.
  • the AP1 610 may generate a beam for transmitting data to the STA2 600 using a transmission steering matrix determined based on the channel state information. In this case, the interference on the AP2 620 may be reduced by the beam formed by the AP1 610.
  • FIG. 7 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • an interference mitigation procedure (or interference mitigation protocol) using a beacon frame including an interference avoidance request information element without a request by the interference prevention request frame is posted.
  • a beacon frame may be used to reduce the overhead of signaling by the interference prevention request frame and the interference prevention response frame used in the procedure for reducing interference in the OBSS environment disclosed in FIGS. 4 to 6.
  • a beacon frame may be used for the interference reduction procedure in the OBSS environment instead of the interference prevention response frame.
  • the beacon frame may include an interference prevention request information element (or interference prevention information element).
  • the beacon frame including the interference prevention request information element may play the same role as the interference prevention request frame.
  • the AP2 720 may periodically transmit a beacon frame 725 including an interference prevention request information element to reduce interference.
  • the interference prevention request information element may indicate transmission of the sounding PPDU 750 after a short inter-frame symbol (SIFS) after transmission of the beacon frame 725.
  • SIFS short inter-frame symbol
  • AP2 720 may transmit a sounding PPDU (eg, NDP frame) to AP1 710 for sounding after SIFS.
  • a sounding PPDU eg, NDP frame
  • the transmitted sounding PPDU 725 may be a steered sounding PPDU for estimating an effective channel.
  • the adjusted sounding PPDU may be generated using a precoding matrix obtained based on another sounding PPDU sent by STA2 700 to AP2 720. This embodiment will be described later in detail.
  • the AP1 710 Upon receiving the beacon frame 725 and the sounding PPDU 750 from the AP2 720, the AP1 710 receives AP1 (based on the training fields (eg, VHT-LTFs) included in the sounding PPDU 750.
  • Channel prediction for the channel may be performed between 710 and AP2 720.
  • the AP1 710 may determine a transmission steering matrix based on the result of channel prediction (or channel state information).
  • AP1 710 may form a beam based on the determined transmission steering matrix.
  • the beam of the AP1 710 formed based on the transmission steering matrix may reduce the interference by the AP1 710 in the communication between the AP2 720 and the STA2 700.
  • FIG. 8 is a conceptual diagram illustrating a method for reducing interference in an OBSS environment according to an embodiment of the present invention.
  • an interference mitigation procedure (or interference mitigation protocol) using a beacon frame including an interference avoidance response information element without a request by the interference prevention request frame is posted.
  • a beacon frame may be used to reduce the overhead of signaling by the interference prevention request frame and the interference prevention response frame used in the procedure for reducing interference in the OBSS environment disclosed in FIGS. 4 to 6.
  • a beacon frame may be used for the interference reduction procedure in the OBSS environment instead of the interference prevention response frame.
  • the beacon frame may include an interference prevention response information element (or interference prevention information element).
  • the beacon frame including the interference prevention response information element may play the same role as the interference prevention response frame.
  • the AP1 810 may not receive the interference prevention request frame from the AP2 820.
  • the AP1 810 may periodically transmit a beacon frame 825 including the interference prevention response information element to reduce interference.
  • the interference prevention response information element (or interference prevention information element) may indicate the transmission of the sounding PPDU 840 after SIFS after transmission of the beacon frame 825.
  • AP1 810 may transmit a sounding PPDU (eg, NDP frame) 840 to AP2 820 for sounding after SIFS. have.
  • the transmitted sounding PPDU 840 may be a adjusted sounding PPDU for estimating an effective channel.
  • the adjusted sounding PPDU may be generated using a precoding matrix obtained based on another sounding PPDU transmitted by STA2 800 to AP1 810. This embodiment will be described later in detail.
  • the AP2 820 that receives the beacon frame 825 and the sounding PPDU 840 from the AP1 810 is based on the training field (eg, VHT-LTF) included in the sounding PPDU 840.
  • Channel prediction may be performed for the channel between the 810 and the AP2 820.
  • the AP2 820 may transmit a result of channel prediction (or channel state information 850) to the AP1 810.
  • the AP2 820 may transmit the channel state information to the AP1 810 by including the channel state information in a frame such as a compressed beam-forming report frame.
  • AP2 820 may include the channel state information in the compressed beamforming report information included in the compressed beamforming report frame and transmit it to AP1 810.
  • AP1 810 may determine a transmission steering matrix based on channel state information 850 included in a frame transmitted from AP2 820. AP1 810 may form a beam based on the determined transmission steering matrix. The beam of the AP1 810 formed based on the transmission steering matrix may reduce interference by the AP1 810 during communication between the AP2 820 and the STA2 800.
  • the interference mitigation procedure is not performed by the exchange of the interference prevention request frame / interference prevention response frame between AP1 and AP2.
  • An interference mitigation procedure may be performed based on an unsolicited manner by AP1.
  • Table 1 below publishes channel state information included in the compressed beamforming report information.
  • Ns may indicate the total number of indices of subcarriers through which the beamforming feedback matrix is transmitted.
  • Ng may indicate an index difference between neighboring subcarriers.
  • Ns may indicate 234 subcarriers.
  • the channel state information may include information on Ns subcarriers. In more detail, the channel state information may be determined based on a beamforming feedback matrix for Ns subcarriers.
  • the interfering AP may determine the transmission steering matrix based on the channel state information.
  • the interfering AP may form a beam based on the determined transmission steering matrix.
  • a basic service area (BSA) of each of a plurality of BSSs overlaps, and an interference reduction procedure of a plurality of APs located in overlapping BSAs has been posted.
  • BSA basic service area
  • an OBSS environment may be expressed when the interfering AP is located in the coverage of the first BSS including the AP, and the AP is located in the coverage of the second BSS including the interfering AP.
  • This interference mitigation procedure may be performed between the AP and the STA as well as between the APs.
  • FIG. 9 is a conceptual diagram illustrating an interference mitigation method according to an embodiment of the present invention.
  • FIG. 9 a method of performing an interference mitigation procedure by transmitting a sounding PPDU to an interfering AP is posted.
  • AP2 920 transmits data to STA2 925 and AP1 910 simultaneously transmits data to STA5 915.
  • the beam formed by the AP1 910 may interfere with the communication between the AP2 920 and the STA2 925, thereby reducing communication performance.
  • STA2 925 may broadcast an interference prevention request frame 930.
  • the AP1 910 may receive the interference prevention request frame 930 from the STA2 925 and transmit the interference prevention response frame 940 to the STA2 925 in response to the interference prevention request frame 930.
  • the STA2 925 may receive the interference prevention response frame 940 from the AP1 910 and transmit the sounding PPDU 950 to the AP1 910.
  • the AP1 910 may obtain channel state information between the STA2 925 and the AP1 910 based on the sounding PPDU 950 received from the STA2 925.
  • AP1 910 may determine the transmission steering matrix based on the channel state information. When AP1 910 forms a beam based on the determined transmission steer matrix, interference due to the beam formed by AP1 910 may be reduced in communication between STA2 925 and AP2 920.
  • the sounding PPDU 950 transmitted by the STA2 925 to the AP1 910 may be an NDP frame.
  • the AP1 910 may perform channel prediction on a 20/40/80/160/80 + 80 MHz channel bandwidth based on a training field (eg, VHT-LTF) included in an NDP frame.
  • AP1 910 may determine the transmission adjustment matrix based on the channel prediction result (channel state information).
  • FIG. 10 is a conceptual diagram illustrating an interference mitigation method according to an embodiment of the present invention.
  • an interference mitigation procedure performed based on a sounding PPDU transmitted by an STA transmitting an interference prevention response frame is posted.
  • the STA2 1025 may broadcast an interference prevention request frame 1030.
  • the AP1 1015 may receive the interference prevention request frame 1030 from the STA2 1025 and transmit the interference prevention response frame 1040 to the STA2 1025 in response to the interference prevention request frame 1030.
  • the AP1 1010 may transmit the sounding PPDU 1050 to the STA2 1025 after an SIFS time after the transmission of the interference prevention response frame 1040.
  • the STA2 1025 may obtain channel state information 1060 for the channel between the AP1 1010 and the STA2 1025 based on the sounding PPDU 1050 received from the AP1 1010.
  • the STA2 1025 may deliver the channel state information 1060 obtained to the AP1 1010.
  • the AP1 1010 may determine a transmission steering matrix based on the channel state information 1060 received from the STA2 1025. When AP1 1010 forms a beam based on the determined transmission steer matrix, interference to STA2 1025 due to the beam formed by AP1 1010 may be reduced.
  • FIG. 11 is a conceptual diagram illustrating an interference mitigation method in an OBSS environment according to an embodiment of the present invention.
  • the AP1 1110 may transmit the beacon frame 1130 instead of the interference prevention response frame in order to reduce signaling overhead caused by the interference reduction request frame and the interference reduction response frame in the interference reduction procedure. That is, an interference mitigation procedure (or interference mitigation protocol) using the beacon frame 1130 including an interference prevention response information element (or interference prevention information element) may be performed without a request by the interference prevention request frame.
  • the beacon frame 1130 including the interference prevention response information element may play a role similar to that of the interference prevention response frame.
  • a beacon frame 1130 including an interference prevention response information element may be periodically transmitted to reduce interference.
  • the interference prevention response information element (or interference prevention information element) may indicate transmission of the sounding PPDU 1150 after a short inter-frame symbol (SIFS) after transmission of the beacon frame 1130.
  • SIFS short inter-frame symbol
  • the AP1 1110 may transmit a sounding PPDU (eg, an NDP frame) 1150 with a SIFS interval for sounding.
  • the transmitted sounding PPDU 1150 may be a steered sounding PPDU for estimation of an effective channel.
  • the adjusted sounding PPDU may be generated using a precoding matrix obtained based on another sounding PPDU transmitted by AP2 1120 to AP1 1110. This embodiment will be described later in detail.
  • the STA2 1125 that receives the beacon frame 1130 and the sounding PPDU 1150 from the AP1 1110 is based on the AP1 (based on a training field (eg, VHT-LTF) included in the sounding PPDU 1150).
  • Channel state information about a channel may be obtained between the 1110 and the STA2 1125.
  • the STA2 may transmit the acquired channel state information 1160 to the AP1 1110.
  • the STA2 1125 may include the channel state information 1160 in the compressed beam-forming report frame and transmit it to the AP1 1110.
  • the STA2 1125 may include the channel state information 1160 in the compressed beamforming report information included in the compressed beamforming report frame and transmit it to the AP1 1110.
  • the channel state information 1160 may include information on Ns subcarriers for a specific channel bandwidth. In more detail, the channel state information 1160 may be determined based on a beamforming feedback matrix for Ns subcarriers.
  • the AP1 1110 may form a beam by determining a transmission steering matrix based on the channel state information 1160 included in the frame transmitted from the STA2 1125.
  • the transmission steering matrix determined by AP1 1110 may reduce interference by AP1 1110 when communicating with STA2 1125 and AP2 1120.
  • the interference mitigation procedure is not performed by the exchange of the interference prevention request frame / interference prevention response frame between AP1 1110 and STA2 1125.
  • An interference mitigation procedure may be performed based on an unsolicited manner by AP1 1110.
  • FIG. 12 is a conceptual diagram illustrating an interference mitigation method in an OBSS environment according to an embodiment of the present invention.
  • a method for AP2 to start transmitting a sounding PPDU is published based on a request to send (RTS) frame / clear to send (CTS) frame.
  • RTS request to send
  • CTS clear to send
  • the AP2 1220 may transmit a frame (similar RTS frame) for performing a function similar to the RTS frame 1225 or the RTS frame 1225 to the STA2 1200 before transmitting the data frame to the STA2 1200.
  • a frame similar RTS frame
  • the STA2 1200 may transmit a frame (similar CTS frame) for performing a function similar to the CTS frame 1205 or the CTS frame to the AP1 1210 or the AP2 1220.
  • the CTS frame 1205 or similar CTS frame may serve as a sounding PPDU.
  • the AP1 1210 and / or the AP2 1220 may receive the CTS frame 1205 or the like CTS frame and generate channel state information based on the received CTS frame 1205 or the like CTS frame.
  • a CTS frame 1205 or a similar CTS frame serving as a sounding PPDU may be expressed by the term sounding CTS frame.
  • the AP1 1210 may determine a transmission steering matrix using channel state information between the STA2 1200 and the AP1 1210 obtained based on the sounding CTS frame 1205.
  • the transmission steering matrix determined by AP1 1210 may form a beam to mitigate interference of AP1 1210 with respect to communication between STA2 1200 and AP2 1220.
  • the STA that receives the RTS frame may transmit a separate sounding PPDU to the AP instead of the CTS frame.
  • AP2 may transmit a frame (similar RTS frame) for performing a function similar to an RTS frame or an RTS frame to STA2 before transmitting a data frame to STA2.
  • STA2 may transmit a CTS frame or a similar CTS frame to AP1 or AP2.
  • STA2 may transmit a separate sounding PPDU after transmitting the CTS frame or the like CTS frame.
  • the STA2 may transmit a sounding PPDU (eg, an NDP frame) after the SIFS time after transmitting the CTS frame or the similar CTS frame.
  • a sounding PPDU eg, an NDP frame
  • the AP1 receiving the sounding PPDU may generate channel state information on a channel between the STA2 and the AP1.
  • AP1 may determine a transmission coordination matrix using channel state information between STA2 and AP1 obtained based on the sounding PPDU.
  • the transmission steering matrix determined by AP1 may reduce AP1's interference to communication between STA2 and AP2.
  • the CTS frame transmitted by STA2 may include an interference mitigation indication field.
  • the interference mitigation indication field may indicate that a sounding PPDU for sounding purpose for interference mitigation is transmitted after the transmission of the CTS frame.
  • the sounding PPDU transmitted in FIGS. 4 to 12 may be a steered sounding PPDU.
  • the coordinated sounding PPDU may be used for estimation of an effective channel between an AP and / or STA transmitting the adjusted sounding PPDU and an AP and / or STA receiving the adjusted sounding PPDU.
  • FIG. 13 is a conceptual diagram for a method of transmitting a calibrated sounding PPDU according to an embodiment of the present invention.
  • the STA2 1325 may transmit the adjusted sounding PPDU to the AP1 1310.
  • the STA2 1325 may obtain a receiving matrix by decomposing (for example, decomposing a singular vector composition) of the channel estimated between the AP21320 and the STA2 1325.
  • the STA2 1325 may use the obtained reception matrix as a precoding matrix of the adjusted sounding PPDU. That is, the STA2 1325 may transmit to the AP1 1310 an adjusted sounding PPDU precoded with a reception matrix determined by decomposing a channel between the AP2 1320 and the STA2 1325.
  • AP1 1310 may form a beam by estimating an effective channel between AP1 1310 and STA2 1325 based on the adjusted sounding PPDU. Through this method, interference applied to the STA2 1325 by the AP1 1310 may be reduced.
  • the received signal r received by STA2 1325 may be represented by Equation 1.
  • P1 may be a precoding matrix of a signal transmitted from AP1 1310 to STA2 1325
  • P2 may be a precoding matrix of a signal transmitted from AP2 1320 to STA2 1325.
  • x1 may be data transmitted from AP1 1310 to STA2 1325
  • x2 may be data transmitted from AP2 1320 to STA2 1325
  • n may be noise.
  • the signal H1P1x1 transmitted by the AP1 1310 is a signal acting as an interference
  • the signal that the STA2 1325 is trying to receive is H2P2x2.
  • AP2 1320 Since AP2 1320 knows the channel information of AP2 1320 and STA2 1325, it can appropriately select precoding matrix P2. For example, if channel decomposition is used, the STA2 1325 may select a reception matrix as U2 and P2 as V2 as shown in Equation 2 below.
  • the precoding matrix P1 that causes the value to be 0 should be selected by the AP1 1310. In a situation where the AP1 1310 can estimate only the channel H1 between the AP1 1310 and the STA2 1325 Interference avoidance that minimizes to 0 (or minimizes to near 0) is limited.
  • AP1 1310 is an effective channel.
  • STA2 1325 causes AP1 1310 to be an effective channel
  • To make an estimate of The precoded sounding PPDU may be transmitted to the AP1 1310.
  • AP1 1310 based on the received precoded sounding PPDU It is possible to determine the precoding matrix P1 that makes the value zero.
  • FIG. 14 is a flowchart illustrating a method of transmitting a calibrated sounding PPDU according to an embodiment of the present invention.
  • the STA2 1400 may transmit an interference prevention request frame 1450, and the AP1 1410 may transmit an interference prevention response frame 1460 in response.
  • STA2 may transmit a sounding PPDU to AP1, AP1 may acquire channel state information based on the received sounding PPDU, and calculate a transmission adjustment matrix based on the channel state information.
  • the beam formed according to the calculated transmission steering matrix may be used to transmit data to STA5.
  • the STA2 1400 may transmit the effective channel information to the AP1 1410 so that the AP1 1410 may estimate the effective channel.
  • the STA2 1400 may transmit effective channel information through the sounding PPDU 1480 adjusted to the AP1 1410.
  • the precoding matrix multiplied by the adjusted sounding PPDU 1480 may be obtained based on the sounding PPDU 1470 transmitted by the AP2 1420 to the STA2 1400. That is, the STA2 1400 obtains a reception matrix (precoding matrix) based on the sounding PPDU 1470 transmitted by the AP2 1420, and transmits the sound to the AP1 1410 based on the obtained reception matrix.
  • the precoding PPDU may be precoded.
  • the adjusted sounding PPDU 1480 which is a precoded sounding PPDU based on the obtained reception matrix, may be transmitted to the AP1 1410.
  • the AP1 1410 may transmit data by forming a beam in a direction of minimizing interference with the STA2 1400 based on the adjusted sounding PPDU 1480.
  • AP1 1400 posts a method of receiving adjusted sounding PPDU reflecting effective channel information from STA2 1400 and obtaining effective channel information.
  • effective channel information Is not based on the channel estimation of AP1, and STA2 is effective channel information. Can be directly transmitted to AP1. That is, STA2 may transmit a frame containing effective channel information to AP1 instead of the adjusted sounding PPDU. Effective channel information at this time May be conveyed as quantized data.
  • a covariance value of a channel between STA2 and AP2 may be transmitted to transmit a adjusted sounding PPDU. That is, the step of transmitting the frame containing the effective channel information It may be replaced by transmitting a covariance value of a channel between STA2 and AP2 as additional compressed information.
  • a situation in which interference from AP1 cannot be reduced or a case in which only some interference is to be selectively reduced may be assumed.
  • a matrix representing an interference subspace acting as the largest interference to STA2 or a matrix for a signal to be selectively attenuated is used as a reception matrix, and the sounding adjusted by precoding the sounding PPDU based on the received matrix.
  • the PPDU may be transmitted to AP1.
  • 15 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • the wireless device 1500 may be an STA that may implement the above-described embodiment, and may be an AP 1550 or a non-AP station (or STA) 1500.
  • the STA 1500 includes a processor 1510, a memory 1520, and a radio frequency unit 1530.
  • the RF unit 1530 may be connected to the processor 1520 to transmit / receive a radio signal.
  • the processor 1520 implements the functions, processes, and / or methods of the STA proposed in the present invention.
  • the processor 1520 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
  • the processor may perform an operation of the STA disclosed in the embodiment of FIGS. 4 to 14.
  • the processor 1520 may be implemented to transmit an interference prevention request frame to the AP and receive an interference prevention response frame from the AP in response to the interference prevention request frame.
  • the processor may be implemented to transmit a sounding PPDU to the AP that transmitted the interference prevention response frame.
  • a transmission steer matrix may be determined and data may be transmitted through a beam generated based on a transmission steering matrix.
  • the AP 1550 includes a processor 1560, a memory 1570, and an RF unit 1580.
  • the RF unit 1580 may be connected to the processor 1560 to transmit / receive a radio signal.
  • the processor 1560 implements the functions, processes, and / or methods proposed in the present invention.
  • the processor 1520 may be implemented to perform the operation of the wireless device according to the embodiment of the present invention described above.
  • the processor may perform the operation of the AP in the embodiment of FIGS. 4 to 14.
  • the processor 1560 receives a beacon frame broadcast by another AP, wherein the beacon frame includes an interference prevention information element, and receives a sounding PPDU directed from the other AP based on the interference prevention information element. It may be implemented to receive, determine a transmission steer matrix based on the sounding PPDU, and transmit data through the beam generated based on the transmission steering matrix.
  • Processors 1510 and 1560 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memories 1520 and 1570 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 1530 and 1580 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memories 1520 and 1570 and executed by the processors 1510 and 1560.
  • the memories 1520 and 1570 may be inside or outside the processors 1510 and 1560, and may be connected to the processors 1510 and 1560 by various well-known means.

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Abstract

L'invention concerne un procédé et un dispositif d'empêchement de brouillage dans une zone de service en chevauchement. Le procédé d'empêchement de brouillage dans une zone de service en chevauchement d'un LAN sans fil peut comprendre les étapes suivantes : un AP brouilleur reçoit une trame de balise transmise par un AP, la trame de balise contenant un élément d'informations d'empêchement de brouillage ; l'AP brouilleur reçoit une PPDU de sondage indiquée d'après l'élément d'informations d'empêchement de brouillage, de l'AP ; l'AP brouilleur détermine une matrice de contrôle de transmission d'après la PPDU de sondage ; et l'AP brouilleur transmet des données via un faisceau généré d'après la matrice de contrôle de transmission.
PCT/KR2014/005400 2013-10-22 2014-06-19 Procédé et dispositif d'empêchement de brouillage dans une zone de service en chevauchement WO2015060514A1 (fr)

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CN113950139A (zh) * 2015-11-03 2022-01-18 韦勒斯标准与技术协会公司 无线通信方法和无线通信终端
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WO2017078442A1 (fr) * 2015-11-03 2017-05-11 주식회사 윌러스표준기술연구소 Procédé de communication sans fil et terminal de communication sans fil dans un environnement à haute densité comprenant des ensembles de services de base superposés
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CN108353425A (zh) * 2015-11-03 2018-07-31 韦勒斯标准与技术协会公司 在包括重叠基本服务集的高密度环境中的无线通信方法和无线通信终端
KR20180064454A (ko) * 2015-11-03 2018-06-14 주식회사 윌러스표준기술연구소 중첩된 베이직 서비스 세트를 포함하는 고밀도 환경에서의 무선 통신 방법 및 무선 통신 단말
US20220007196A1 (en) 2016-04-02 2022-01-06 Wilus Institute Of Standards And Technology Inc. Wireless communication method and wireless communication terminal for spatial reuse of overlapped basic service set
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